Korean Peninsula as an ancient and strategic land, is the place of one of the most complex and difficult riddles of the international scene and the division of Korean Peninsula can be considered the largest remaining legacy of World War II in northeastern Asia. Korean Peninsula have been the strategic battlefield of self-interested global and regional powers for centuries, and due to its geopolitical position still hosts the conflict of regional and global powers’ interests and their competitions. North Korea’s nuclear issue and the division of the peninsula not only has affected the people of this land, but also the whole region of Northeast Asia. Hence, it is expected that the Korean Reunification would cause dramatic changes in the visage of Northeast Asia as well as the regional balance of power. In this regard, the question of present research would be: What are the strategic implications of the probable Korean Reunification? The hypothesis of the paper is that the Korean Reunification, while challenging the current security situation of the region, will increase the tensions among the powers and raise the role of Unified Korea in the political and economic fields